Comprehensive anticorrosive method of metal pipe fitting

A metal pipe fitting and surface composite technology, applied in metal material coating process, coating, hot dip plating process, etc., can solve the problems of poor adhesion of anti-corrosion layer on the surface of vehicle pipeline, and achieve good generalizability and adhesion. Strong, economical and environmentally friendly results

Inactive Publication Date: 2010-06-09
CHINA NORTH VEHICLE RES INST
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Problems solved by technology

[0003] In order to solve the problem of poor adhesion of the anti-corrosion layer on the surface of the vehicle pipeline in the prior art, the present invention provides an anti-corrosion method with strong adhesion, corrosion resistance and good weather resistance, and is not limited by the complex structure of the workpiece

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  • Comprehensive anticorrosive method of metal pipe fitting

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Embodiment Construction

[0019] In the present invention, the metal pipe fittings that need to be processed are sequentially carried out in the following steps:

[0020] 1. Degreasing and rust removal;

[0021] (1) High-temperature sintering: put the metal pipe fittings in a zinc-chromium-coated baking furnace, adjust the furnace temperature to 300-320°C, and bake for 20 minutes.

[0022] (2) Mechanical shot blasting: Put the metal pipe fittings in the shot blasting machine for 5 minutes.

[0023] 2. Composite phosphating:

[0024] Put the metal pipe fittings after step 1 in the compound phosphating solution with a temperature of 90-98°C to carry out surface compound phosphating treatment for 15 minutes (the solution is no longer bubbling by visual inspection), and the coating thickness is 5-8 μm.

[0025] Formula of compound phosphating solution (both industrial grade chemical materials): 40-70g / l of Maziv salt, 4-7g / l of nickel nitrate, 40-70g / l of manganese nitrate, 2-5g / l of sodium fluoride.

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Abstract

The invention relates to a comprehensive anticorrosive method of a metal pipe fitting, in particular to a comprehensive anticorrosive method combined with a plurality of anticorrosive treatments on the surface of a vehicle metal pipe fitting. The pipe fitting needed to be treated is sequentially treated by the following steps: A, oil removal and derusting; B, Zn-Cr coating; and C, top layer closing, wherein composite phosphating treatment is carried out before the step B. In the anticorrosive method, based on a Zn-Cr coating and aiming at the advantages and the disadvantages of the Zn-Cr coating as well as the structural and using particularity of a water system pipe fitting, a new comprehensive anticorrosive technology combined composite phosphating, Zn-Cr coating and top layer closing is adopted, so that an obtained composite coating achieves the advantages of strong adhesive force, high temperature resistance (280 DEG C) and flushing resistance, obviously enhances the anticorrosion ability of a pipeline, and has stronger binding force and flushing resistance compared with the ordinary Dacromet treatment technology.

Description

technical field [0001] The invention relates to an anti-corrosion treatment method, in particular to a comprehensive anti-corrosion method combined with various anti-corrosion treatments on the surface of a metal pipe fitting of a vehicle. Background technique [0002] At present, the anti-corrosion of the surface of the vehicle pipeline is usually painted or galvanized. Although the above-mentioned technology is simple and feasible, the coating is extremely difficult under the erosion of the internal medium (water or antifreeze) and the drastic change of the working temperature (-40 ~ 120 ℃). Easy to fall off, the base material is seriously corroded. What's more serious is that the peeled coating and corrosion products are easy to block the heat exchanger and other components, thereby affecting the heat dissipation of the vehicle. Although the ordinary dacromet treatment process has better anti-rust effect, its adhesion to the metal surface is poor, and the coating is easi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/02C23C2/26C23C2/38
Inventor 周丽赵春伟陈韶欣刘建峰李欣张佳卉李云龙石军
Owner CHINA NORTH VEHICLE RES INST
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